Fluid metering, mixing and composition control system
Patent 5423661 Issued on June 13, 1995. Estimated Expiration Date: 
April 28, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 28, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1076299 1418741 1843246 2400485 2737341 3238883 3259073 3716306 Liquid chromatography sample measuring and introducing apparatus Magnetic pump InventorsAssigneeApplicationNo. 235007 filed on 04/28/1994US Classes:417/410.4, Interengaging rotary pumping members210/101, Proportionate feed means210/198.2, Chromatography417/420, Pump magnetically coupled to rotary drive418/188Supply or exhaust passage through working member center of rotationExaminersPrimary: Therkorn, Ernest G.International ClassesB01D 015/08F04B 017/00 AbstractA gear pump is used for the primary flow source for a low pressure, high performance separation system. The pump is controlled such that its flow and leakage characteristics are compensated by an electronic controller which results in controlled output flow rates to a variety of loads. The pump is particularly suited for use in liquid chromatography (LC) systems, especially LC systems which use membrane based separation media. A modification to the gear pump results in an efficient mixer, further enhancing its use in LC systems which involve gradient operational modes. Also disclosed are embodiments which allow the gear pump to be used in high pressure separation systems, e.g., high performance liquid chromatography (HPLC) systems.Other References
Field of SearchLiquid/liquid or gel type (i.e., jellylike) chromatographyChromatography Including liquid flow diversion Chromatography Proportionate feed means With pump, gas pressure or vacuum source With pump, gas pressure, or suction source ADJUNCTS Rotary expansible chamber pump Interengaging rotary pumping members Pump magnetically coupled to rotary drive Supply or exhaust passage through working member center of rotation | |
